Journal
PHYSICAL REVIEW LETTERS
Volume 102, Issue 16, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.102.166808
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Funding
- DOE [DE-FG02-07ER46351]
- ONR/DMEA [H94003-07-2-0703]
- NSF [DMR/0748910, CBET/0756359]
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We report a thermoelectric study of graphene in both zero and applied magnetic fields. As a direct consequence of the linear dispersion of massless particles, we find that the Seebeck coefficient S-xx diverges with 1/root|n(2D)|, where n(2D) is the carrier density. We observe a very large Nernst signal S-xy (similar to 50 mu V/K at 8 T) at the Dirac point, and an oscillatory dependence of both S-xx and S-xy on n(2D) at low temperatures. Our results underscore the anomalous thermoelectric transport in graphene, which may be used as a highly sensitive probe for impurity bands near the Dirac point.
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